Need Your Advice re: Sharing BFP with SO

Brittany
So I just left the doctor at 3 weeks 5 days. He did a vaginal ultrasound and couldn't see anything which he expected and I'm still showing a faint line on the urine test. 
He cautioned me with sharing the news, including my spouse since it's so early. I planned to surprise the hubby tonight but now I'm having second thoughts. Any advice is appreciated.